Joule Thief 101

[poynt99]

Is a resonant system that is not resonating in resonance?

What is your opinion?

[poynt99]

No, the glass never stops, correct.

What it does do is stop deforming in one direction. At that point, maximum deformation is reached for that half cycle.

Was it really much of a cognitive stretch to make that connection? I think yer gettin a little bit picky and splittin hairs there guys.

[Magluvin]

No, the glass never stops, correct.

What it does do is stop deforming in one direction. At that point, maximum deformation is reached for that half cycle.

Was it really much of a cognitive stretch to make that connection? I think yer gettin a little bit picky and splittin hairs there guys.

Ok. I agree there. Like the peak of a sine wave. Spring fully compressed.

But due to possible imperfections and such, there still may be some inertial motion of some portions of the glass actually moving when at that peak. That one vid had shown some amazing distortions compared to some others. Almost slow motion water balloon looking where it doesnt look like everything stops at any point.

Mags

[tinman]

Did you mean reactance, not resistance? Resistance doesn't change with frequency, but reactance does.

Is there any other way to increase or decrease (dynamically) the impedance of an air coil at a given frequency? I am not sure why you say resistance dose not increase woth frequency increase

What kind of test could you conduct to play with the idea?

No i was refering to effective resistace that is related to frequency increase. .i am not sure why you would say that resistance  dose not change with a frequency  increase,when we know it dose.

You know what -forget it. I just asked a simple question ,and get no answer-but just questions.


Brad

[poynt99]

No i was refering to effective resistace that is related to frequency increase. .i am not sure why you would say that resistance  dose not change with a frequency  increase,when we know it dose.

Does it? A pure resistance doesn't change its resistance value with frequency.

If it is how you say "we know it does", kindly demonstrate it or link to an example please.

I just asked a simple question ,and get no answer-but just questions.

Your question provoked me to think about modifying the impedance of a coil or transformer, so I tried to engage you to think about it too, hence the questions. I thought we'd explore the concept in tandem.